Followed by:
purely a correlation.
To investigate this further, a team from the Department of Clinical Neurosciences at the University of Cambridge first carried out a meta-analysis of studies encompassing more than 100 million people. (…) This approach allows researchers to bring together studies which, on their own may not provide sufficient evidence and sometimes disagree with each other, to provide more robust conclusions.
Right at the beginning of the article:
“Our analysis suggests that it is these drugs themselves that increase the risk of stroke, not just other lifestyle factors among users.”